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Baba A, Kurokawa R, Kurokawa M, Ota Y, Srinivasan A. Dynamic Contrast-Enhanced MRI Parameters and Normalized ADC Values Could Aid Differentiation of Skull Base Osteomyelitis from Nasopharyngeal Cancer. AJNR Am J Neuroradiol 2023; 44:74-78. [PMID: 36521963 PMCID: PMC9835913 DOI: 10.3174/ajnr.a7740] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 11/15/2022] [Indexed: 12/23/2022]
Abstract
BACKGROUND AND PURPOSE The skull base osteomyelitis sometimes can be difficult to distinguish from nasopharyngeal cancer. This study aimed to investigate the differences between skull base osteomyelitis and nasopharyngeal cancer using dynamic contrast-enhanced MR imaging and normalized ADC values. MATERIALS AND METHODS This study included 8 and 12 patients with skull base osteomyelitis and nasopharyngeal cancer, respectively, who underwent dynamic contrast-enhanced MR imaging and DWI before primary treatment. Quantitative dynamic contrast-enhanced MR imaging parameters and ADC values of the ROIs were analyzed. Normalized ADC parameters were calculated by dividing the ROIs of the lesion by that of the spinal cord. RESULTS The rate transfer constant between extravascular extracellular space and blood plasma per minute (Kep) was significantly lower in patients with skull base osteomyelitis than in those with nasopharyngeal cancer (median, 0.43 versus 0.57; P = .04). The optimal cutoff value of Kep was 0.48 (area under the curve, 0.78; 95% CI, 0.55-1). The normalized mean ADC was significantly higher in patients with skull base osteomyelitis than in those with nasopharyngeal cancer (median, 1.90 versus 0.87; P < .001). The cutoff value of normalized mean ADC was 1.55 (area under the curve, 0.96; 95% CI, 0.87-1). The area under the curve of the combination of dynamic contrast-enhanced MR imaging parameters (Kep and extravascular extracellular space volume per unit tissue volume) was 0.89 (95% CI, 0.73-1), and the area under the curve of the combination of dynamic contrast-enhanced MR imaging parameters and normalized mean ADC value was 0.98 (95% CI, 0.93-1). CONCLUSIONS Quantitative dynamic contrast-enhanced MR imaging parameters and normalized ADC values may be useful in differentiating skull base osteomyelitis and nasopharyngeal cancer. The combination of dynamic contrast-enhanced MR imaging parameters and normalized ADC values outperformed each measure in isolation.
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Affiliation(s)
- A Baba
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
- Department of Radiology (A.B.), The Jikei University School of Medicine, Tokyo, Japan
| | - R Kurokawa
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - M Kurokawa
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - Y Ota
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Srinivasan
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
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Ota Y, Liao E, Capizzano AA, Baba A, Kurokawa R, Kurokawa M, Srinivasan A. Differentiation of Skull Base Chondrosarcomas, Chordomas, and Metastases: Utility of DWI and Dynamic Contrast-Enhanced Perfusion MR Imaging. AJNR Am J Neuroradiol 2022; 43:1325-1332. [PMID: 35953276 PMCID: PMC9451640 DOI: 10.3174/ajnr.a7607] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Accepted: 06/28/2022] [Indexed: 01/26/2023]
Abstract
BACKGROUND AND PURPOSE Differentiation of skull base tumors, including chondrosarcomas, chordomas, and metastases, on conventional imaging remains a challenge. We aimed to test the utility of DWI and dynamic contrast-enhanced MR imaging for skull base tumors. MATERIALS AND METHODS Fifty-nine patients with chondrosarcomas, chordomas, or metastases between January 2015 and October 2021 were included in this retrospective study. Pretreatment normalized mean ADC and dynamic contrast-enhanced MR imaging parameters were calculated. The Kruskal-Wallis H test for all tumor types and the Mann-Whitney U test for each pair of tumors were used. RESULTS Fifteen chondrosarcomas (9 men; median age, 62 years), 14 chordomas (6 men; median age, 47 years), and 30 metastases (11 men; median age, 61 years) were included in this study. Fractional plasma volume helped distinguish all 3 tumor types (P = .003, <.001, and <.001, respectively), whereas the normalized mean ADC was useful in distinguishing chondrosarcomas from chordomas and metastases (P < .001 and P < .001, respectively); fractional volume of extracellular space, in distinguishing chondrosarcomas from metastases (P = .02); and forward volume transfer constant, in distinguishing metastases from chondrosarcomas/chondroma (P = .002 and .002, respectively) using the Kruskal-Wallis H test. The diagnostic performances of fractional plasma volume for each pair of tumors showed areas under curve of 0.86-0.99 (95% CI, 0.70-1.0); the forward volume transfer constant differentiated metastases from chondrosarcomas/chordomas with areas under curve of 0.82 and 0.82 (95% CI, 0.67-0.98), respectively; and the normalized mean ADC distinguished chondrosarcomas from chordomas/metastases with areas under curve of 0.96 and 0.95 (95% CI, 0.88-1.0), respectively. CONCLUSIONS DWI and dynamic contrast-enhanced MR imaging sequences can be beneficial for differentiating the 3 common skull base tumors.
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Affiliation(s)
- Y Ota
- From the Division of Neuroradiology (Y.O., E.L., A.A.C., A.B., R.K., M.K., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - E Liao
- From the Division of Neuroradiology (Y.O., E.L., A.A.C., A.B., R.K., M.K., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A A Capizzano
- From the Division of Neuroradiology (Y.O., E.L., A.A.C., A.B., R.K., M.K., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Baba
- From the Division of Neuroradiology (Y.O., E.L., A.A.C., A.B., R.K., M.K., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
- Department of Radiology (A.B.), Jikei University School of Medicine Ringgold standard institution, Tokyo, Japan
| | - R Kurokawa
- From the Division of Neuroradiology (Y.O., E.L., A.A.C., A.B., R.K., M.K., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
- Department of Radiology (R.K.), The University of Tokyo Hospital, Tokyo, Japan
| | - M Kurokawa
- From the Division of Neuroradiology (Y.O., E.L., A.A.C., A.B., R.K., M.K., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
- Department of Radiology (M.K.), Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Ringgold standard institution, Bunkyo-ku, Japan
| | - A Srinivasan
- From the Division of Neuroradiology (Y.O., E.L., A.A.C., A.B., R.K., M.K., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
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Baba A, Kurokawa R, Rawie E, Kurokawa M, Ota Y, Srinivasan A. Normalized Parameters of Dynamic Contrast-Enhanced Perfusion MRI and DWI-ADC for Differentiation between Posttreatment Changes and Recurrence in Head and Neck Cancer. AJNR Am J Neuroradiol 2022; 43:1184-1189. [PMID: 35835592 PMCID: PMC9575415 DOI: 10.3174/ajnr.a7567] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 05/22/2022] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND PURPOSE Differentiating recurrence from benign posttreatment changes has clinical importance in the imaging follow-up of head and neck cancer. This study aimed to investigate the utility of normalized dynamic contrast-enhanced MR imaging and ADC for their differentiation. MATERIALS AND METHODS This study included 51 patients with a history of head and neck cancer who underwent follow-up dynamic contrast-enhanced MR imaging with DWI-ADC, of whom 25 had recurrences and 26 had benign posttreatment changes. Quantitative and semiquantitative dynamic contrast-enhanced MR imaging parameters and ADC of the ROI and reference region were analyzed. Normalized dynamic contrast-enhanced MR imaging parameters and normalized DWI-ADC parameters were calculated by dividing the ROI by the reference region. RESULTS Normalized plasma volume, volume transfer constant between extravascular extracellular space and blood plasma per minute (K trans), area under the curve, and wash-in were significantly higher in patients with recurrence than in those with benign posttreatment change (P = .003 to <.001). The normalized mean ADC was significantly lower in patients with recurrence than in those with benign posttreatment change (P < .001). The area under the receiver operating characteristic curve of the combination of normalized dynamic contrast-enhanced MR imaging parameters with significance (normalized plasma volume, normalized extravascular extracellular space volume per unit tissue volume, normalized K trans, normalized area under the curve, and normalized wash-in) and normalized mean ADC was 0.97 (95% CI, 0.93-1). CONCLUSIONS Normalized dynamic contrast-enhanced MR imaging parameters, normalized mean ADC, and their combination were effective in differentiating recurrence and benign posttreatment changes in head and neck cancer.
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Affiliation(s)
- A Baba
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - R Kurokawa
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - E Rawie
- Department of Radiology (E.R.), Brooke Army Medical Center, San Antonio, Texas
| | - M Kurokawa
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - Y Ota
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Srinivasan
- From the Division of Neuroradiology (A.B., R.K., M.K., Y.O., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
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Ota Y, Leung D, Lin E, Liao E, Kurokawa R, Kurokawa M, Baba A, Yokota H, Bathla G, Moritani T, Srinivasan A, Capizzano A. Prognostic Factors of Stroke-Like Migraine Attacks after Radiation Therapy (SMART) Syndrome. AJNR Am J Neuroradiol 2022; 43:396-401. [PMID: 35177545 PMCID: PMC8910816 DOI: 10.3174/ajnr.a7424] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 12/10/2021] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Prognostic factors of stroke-like migraine attacks after radiation therapy (SMART) syndrome have not been fully explored. This study aimed to assess clinical and imaging features to predict the clinical outcome of SMART syndrome. MATERIALS AND METHODS We retrospectively reviewed the clinical manifestations and imaging findings of 20 patients with SMART syndrome (median age, 48 years; 5 women) from January 2016 to January 2020 at 4 medical centers. Patient demographics and MR imaging features at the time of diagnosis were reviewed. This cohort was divided into 2 groups based on the degree of clinical improvement (completely versus incompletely recovered). The numeric and categoric variables were compared as appropriate. RESULTS There were statistically significant differences between the completely recovered group (n = 11; median age, 44 years; 2 women) and the incompletely recovered group (n = 9; median age, 55 years; 3 women) in age, months of follow-up, and the presence of steroid treatment at diagnosis (P = .028, .002, and .01, respectively). Regarding MR imaging features, there were statistically significant differences in the presence of linear subcortical WM susceptibility abnormality, restricted diffusion, and subcortical WM edematous changes in the acute SMART region (3/11 versus 8/9, P = .01; 0/11 versus 4/9, P = .026; and 2/11 versus 7/9, P = .022, respectively). Follow-up MRIs showed persistent susceptibility abnormality (11/11) and subcortical WM edematous changes (9/9), with resolution of restricted diffusion (4/4). CONCLUSIONS Age, use of steroid treatment at the diagnosis of SMART syndrome, and MR imaging findings of abnormal susceptibility signal, restricted diffusion, and subcortical WM change in the acute SMART region can be prognostic factors in SMART syndrome.
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Affiliation(s)
- Y. Ota
- From the Division of Neuroradiology (Y.O., E. Liao, R.K., M.K., A.B., T.M., A.S., A.A.C.)
| | - D. Leung
- Department of Radiology and Division of Neuro-Oncology (D.L.), Department of Neurology, University of Michigan, Ann Arbor, Michigan
| | - E. Lin
- Division of Neuroradiology (E. Lin), Department of Radiology, University of Rochester Medical Center, Rochester, New York
| | - E. Liao
- From the Division of Neuroradiology (Y.O., E. Liao, R.K., M.K., A.B., T.M., A.S., A.A.C.)
| | - R. Kurokawa
- From the Division of Neuroradiology (Y.O., E. Liao, R.K., M.K., A.B., T.M., A.S., A.A.C.)
| | - M. Kurokawa
- From the Division of Neuroradiology (Y.O., E. Liao, R.K., M.K., A.B., T.M., A.S., A.A.C.)
| | - A. Baba
- From the Division of Neuroradiology (Y.O., E. Liao, R.K., M.K., A.B., T.M., A.S., A.A.C.)
| | - H. Yokota
- Department of Diagnostic Radiology and Radiation Oncology (H.Y.), Graduate School of Medicine, Chiba University, Chiba, Japan
| | - G. Bathla
- Division of Neuroradiology (G.B.), Department of Radiology, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - T. Moritani
- From the Division of Neuroradiology (Y.O., E. Liao, R.K., M.K., A.B., T.M., A.S., A.A.C.)
| | - A. Srinivasan
- From the Division of Neuroradiology (Y.O., E. Liao, R.K., M.K., A.B., T.M., A.S., A.A.C.)
| | - A.A. Capizzano
- From the Division of Neuroradiology (Y.O., E. Liao, R.K., M.K., A.B., T.M., A.S., A.A.C.)
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Baba A, Kurokawa R, Kurokawa M, Hassan O, Ota Y, Srinivasan A. ADC for Differentiation between Posttreatment Changes and Recurrence in Head and Neck Cancer: A Systematic Review and Meta-analysis. AJNR Am J Neuroradiol 2022; 43:442-447. [PMID: 35210272 PMCID: PMC8910821 DOI: 10.3174/ajnr.a7431] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 12/31/2021] [Indexed: 01/02/2023]
Abstract
BACKGROUND Previous studies reported that the ADC values of recurrent head and neck cancer lesions are lower than those of posttreatment changes, however, the utility of ADC to differentiate them has not been definitively summarized and established. PURPOSE Our aim was to evaluate the diagnostic benefit of ADC calculated from diffusion-weighted imaging in differentiating recurrent lesions from posttreatment changes in head and neck cancer. DATA SOURCES MEDLINE, Scopus, and EMBASE data bases were searched for studies. STUDY SELECTION The review identified 6 prospective studies with a total of 365 patients (402 lesions) who were eligible for the meta-analysis. DATA ANALYSIS Forest plots were used to assess the mean difference in ADC values. Heterogeneity among the studies was evaluated using the Cochrane Q test and the I2 statistic. DATA SYNTHESIS Among included studies, the overall mean of ADC values of recurrent lesions was 1.03 × 10-3mm2/s and that of the posttreatment changes was 1.51 × 10-3mm2/s. The ADC value of recurrence was significantly less than that of posttreatment changes in head and neck cancer (pooled mean difference: -0.45; 95% CI, -0.59-0.32, P < .0001) with heterogeneity among studies. The threshold of ADC values between recurrent lesions and posttreatment changes was suggested to be 1.10 × 10-3mm2/s. LIMITATIONS Given the heterogeneity of the data of the study, the conclusions should be interpreted with caution. CONCLUSIONS The ADC values in recurrent head and neck cancers are lower than those of posttreatment changes, and the threshold of ADC values between them was suggested.
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Affiliation(s)
- A. Baba
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - R. Kurokawa
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - M. Kurokawa
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - O. Hassan
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - Y. Ota
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A. Srinivasan
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
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Kurokawa R, Baba A, Kurokawa M, Capizzano A, Hassan O, Johnson T, Ota Y, Kim J, Hagiwara A, Moritani T, Srinivasan A. Pretreatment ADC Histogram Analysis as a Prognostic Imaging Biomarker for Patients with Recurrent Glioblastoma Treated with Bevacizumab: A Systematic Review and Meta-analysis. AJNR Am J Neuroradiol 2022; 43:202-206. [PMID: 35058300 PMCID: PMC8985678 DOI: 10.3174/ajnr.a7406] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 11/15/2021] [Indexed: 02/03/2023]
Abstract
BACKGROUND The mean ADC value of the lower Gaussian curve (ADCL) derived from the bi-Gaussian curve-fitting histogram analysis has been reported as a predictive/prognostic imaging biomarker in patients with recurrent glioblastoma treated with bevacizumab; however, its systematic summary has been lacking. PURPOSE We applied a systematic review and meta-analysis to investigate the predictive/prognostic performance of ADCL in patients with recurrent glioblastoma treated with bevacizumab. DATA SOURCES We performed a literature search using PubMed, Scopus, and EMBASE. STUDY SELECTION A total of 1344 abstracts were screened, of which 83 articles were considered potentially relevant. Data were finally extracted from 6 studies including 578 patients. DATA ANALYSIS Forest plots were generated to illustrate the hazard ratios of overall survival and progression-free survival. The heterogeneity across the studies was assessed using the Cochrane Q test and I2 values. DATA SYNTHESIS The pooled hazard ratios for overall survival and progression-free survival in patients with an ADCL lower than the cutoff values were 1.89 (95% CI, 1.53-2.31) and 1.98 (95% CI, 1.54-2.55) with low heterogeneity among the studies. Subgroup analysis of the bevacizumab-free cohort showed a pooled hazard ratio for overall survival of 1.20 (95% CI, 1.08-1.34) with low heterogeneity. LIMITATIONS The conclusions are limited by the difference in the definition of recurrence among the included studies. CONCLUSIONS This systematic review with meta-analysis supports the prognostic value of ADCL in patients with recurrent glioblastoma treated with bevacizumab, with a low ADCL demonstrating decreased overall survival and progression-free survival. On the other hand, the predictive role of ADCL for bevacizumab treatment was not confirmed.
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Affiliation(s)
- R. Kurokawa
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A. Baba
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - M. Kurokawa
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A. Capizzano
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - O. Hassan
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - T. Johnson
- Department of Biostatistics (T.J.), University of Michigan School of Public Health, Ann Arbor, Michigan
| | - Y. Ota
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - J. Kim
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A. Hagiwara
- Department of Radiology (A.H.), Juntendo University School of Medicine, Tokyo, Japan
| | - T. Moritani
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A. Srinivasan
- From the Division of Neuroradiology (R.K., A.B., M.K., A.C., O.H., Y.O., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
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Ota Y, Liao E, Capizzano AA, Kurokawa R, Bapuraj JR, Syed F, Baba A, Moritani T, Srinivasan A. Diagnostic Role of Diffusion-Weighted and Dynamic Contrast-Enhanced Perfusion MR Imaging in Paragangliomas and Schwannomas in the Head and Neck. AJNR Am J Neuroradiol 2021; 42:1839-1846. [PMID: 34446460 DOI: 10.3174/ajnr.a7266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 06/08/2021] [Indexed: 01/21/2023]
Abstract
BACKGROUND AND PURPOSE Distinguishing schwannomas from paragangliomas in the head and neck and determining succinate dehydrogenase (SDH) mutation status in paragangliomas are clinically important. We aimed to assess the clinical usefulness of DWI and dynamic contrast-enhanced MR imaging in differentiating these 2 types of tumors, as well as the SDH mutation status of paragangliomas. MATERIALS AND METHODS This retrospective study from June 2016 to June 2020 included 42 patients with 15 schwannomas and 27 paragangliomas (10 SDH mutation-positive and 17 SDH mutation-negative). ADC values, dynamic contrast-enhanced MRI parameters, and tumor imaging characteristics were compared between the 2 tumors and between the mutation statuses of paragangliomas as appropriate. Multivariate stepwise logistic regression analysis was performed to identify significant differences in these parameters. RESULTS Fractional plasma volume (P ≤ .001), rate transfer constant (P = .038), time-to-maximum enhancement (P < .001), maximum signal-enhancement ratio (P < .001) and maximum concentration of contrast agent (P < .001), velocity of enhancement (P = .002), and tumor characteristics including the presence of flow voids (P = .001) and enhancement patterns (P = .027) showed significant differences between schwannomas and paragangliomas, though there was no significant difference in ADC values. In the multivariate logistic regression analysis, fractional plasma volume was identified as the most significant value for differentiation of the 2 tumor types (P = .014). ADC values were significantly higher in nonhereditary than in hereditary paragangliomas, while there was no difference in dynamic contrast-enhanced MR imaging parameters. CONCLUSIONS Dynamic contrast-enhanced MR imaging parameters show promise in differentiating head and neck schwannomas and paragangliomas, while DWI can be useful in detecting SDH mutation status in paragangliomas.
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Affiliation(s)
- Y Ota
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - E Liao
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A A Capizzano
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - R Kurokawa
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - J R Bapuraj
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - F Syed
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Baba
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - T Moritani
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Srinivasan
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
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Ota Y, Naganawa S, Kurokawa R, Bapuraj JR, Capizzano A, Kim J, Moritani T, Srinivasan A. Assessment of MR Imaging and CT in Differentiating Hereditary and Nonhereditary Paragangliomas. AJNR Am J Neuroradiol 2021; 42:1320-1326. [PMID: 33985956 DOI: 10.3174/ajnr.a7166] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 02/15/2021] [Indexed: 01/11/2023]
Abstract
BACKGROUND AND PURPOSE Head and neck paragangliomas have been reported to be associated with mutations of the succinate dehydrogenase enzyme family. The aim of this study was to assess whether radiologic features could differentiate between paragangliomas in the head and neck positive and negative for the succinate dehydrogenase mutation. MATERIALS AND METHODS This single-center retrospective review from January 2015 to January 2020 included 40 patients with 48 paragangliomas (30 tumors positive for succinate dehydrogenase mutation in 23 patients and 18 tumors negative for the succinate dehydrogenase mutation in 17 patients). ADC values and tumor characteristics on CT and MR imaging were evaluated by 2 radiologists. Differences between the 2 cohorts in the diagnostic performance of ADC and normalized ADC (ratio to ADC in the medulla oblongata) values were evaluated using the independent samples t test. P < .05 was considered significant. RESULTS ADCmean (1.07 [SD, 0.25]/1.04 [SD, 0.12] versus 1.31 [SD, 0.16]/1.30 [SD, 0.20]× 10-3 mm2/s by radiologists 1 and 2; P < .001), ADCmaximum (1.49 [SD, 0.27]/1.49 [SD, 0.20] versus 2.01 [SD, 0.16]/1.87 [SD, 0.20] × 10-3 mm2/s; P < .001), normalized ADCmean (1.40 [SD, 0.33]/1.37 [SD, 0.16] versus 1.73 [SD, 0.22]/1.74 [SD, 0.27]; P < .001), and normalized ADCmaximum (1.95 [SD, 0.37]/1.97 [SD, 0.27] versus 2.64 [SD, 0.22]/2.48 [SD, 0.28]; P < .001) were significantly lower in succinate dehydrogenase mutation-positive than mutation-negative tumors. ADCminimum, normalized ADCminimum, and tumor characteristics were not statistically significant. CONCLUSIONS ADC is a promising imaging biomarker that can help differentiate succinate dehydrogenase mutation-positive from mutation-negative paragangliomas in the head and neck.
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Affiliation(s)
- Y Ota
- From the Division of Neuroradiology (Y.O., S.N., J.R.B., A.C., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - S Naganawa
- From the Division of Neuroradiology (Y.O., S.N., J.R.B., A.C., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - R Kurokawa
- Department of Radiology (R.K.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - J R Bapuraj
- From the Division of Neuroradiology (Y.O., S.N., J.R.B., A.C., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Capizzano
- From the Division of Neuroradiology (Y.O., S.N., J.R.B., A.C., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - J Kim
- From the Division of Neuroradiology (Y.O., S.N., J.R.B., A.C., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - T Moritani
- From the Division of Neuroradiology (Y.O., S.N., J.R.B., A.C., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Srinivasan
- From the Division of Neuroradiology (Y.O., S.N., J.R.B., A.C., J.K., T.M., A.S.), Department of Radiology, University of Michigan, Ann Arbor, Michigan
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9
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Kurokawa R, Ota Y, Gonoi W, Hagiwara A, Kurokawa M, Mori H, Maeda E, Amemiya S, Usui Y, Sato N, Nakata Y, Moritani T, Abe O. MRI Findings of Immune Checkpoint Inhibitor-Induced Hypophysitis: Possible Association with Fibrosis. AJNR Am J Neuroradiol 2020; 41:1683-1689. [PMID: 32763900 PMCID: PMC7583108 DOI: 10.3174/ajnr.a6692] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 06/02/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND PURPOSE Hypophysitis is one of the well-known adverse effects of immune checkpoint inhibitors. Immune checkpoint inhibitor-induced hypophysitis frequently causes irreversible hypopituitarism, which requires long-term hormone replacement. Despite the high frequency and clinical significance, characteristic MR imaging findings of immune checkpoint inhibitor-induced hypophysitis have not been established. In the present study, we aimed to review and extract the MR imaging features of immune checkpoint inhibitor-induced hypophysitis. MATERIALS AND METHODS This retrospective international multicenter study comprised 20 patients with melanoma who were being treated with immune checkpoint inhibitors and clinically diagnosed with immune checkpoint inhibitor-induced hypophysitis. Three radiologists evaluated the following MR imaging findings: enlargement of the pituitary gland and stalk; homogeneity of enhancement of the pituitary gland; presence/absence of a well-defined poorly enhanced area and, if present, its location, shape, and signal intensity in T2WI; and enhancement pattern in contrast-enhanced dynamic MR imaging. Clinical symptoms and hormone levels were also recorded. RESULTS Enlargement of the pituitary gland and stalk was observed in 12 and 20 patients, respectively. Nineteen patients showed poorly enhanced lesions (geographic hypoenhancing lesions) in the anterior lobe, and 11 of these lesions showed hypointensity on T2WI. Thyrotropin deficiency and corticotropin deficiency were observed in 19/20 and 12/17 patients, respectively, which persisted in 12/19 and 10/12 patients, respectively, throughout the study period. CONCLUSIONS Pituitary geographic hypoenhancing lesions in the anterior lobe of the pituitary gland are characteristic and frequent MR imaging findings of immune checkpoint inhibitor-induced hypophysitis. They reflect fibrosis and are useful in distinguishing immune checkpoint inhibitor-induced hypophysitis from other types of hypophysitis/tumors.
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Affiliation(s)
- R Kurokawa
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Y Ota
- Division of Neuroradiology (Y.O., T.M.), Department of Radiology, Michigan Medicine, Ann Arbor, Michigan
| | - W Gonoi
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - A Hagiwara
- Department of Radiology (A.H.), Juntendo University School of Medicine, Tokyo, Japan
| | - M Kurokawa
- Department of Radiology (M.K.), Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan
| | - H Mori
- Department of Radiology (H.M.), Jichi Medical University, Tochigi-ken, Japan
| | - E Maeda
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - S Amemiya
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Y Usui
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - N Sato
- Department of Radiology (N.S.), Tokyo Metropolitan Neurological Hospital, Tokyo, Japan
| | - Y Nakata
- Department of Radiology (Y.N.), National Center of Neurology and Psychiatry, Tokyo, Japan
| | - T Moritani
- Division of Neuroradiology (Y.O., T.M.), Department of Radiology, Michigan Medicine, Ann Arbor, Michigan
| | - O Abe
- From the Department of Radiology (R.K., W.G., E.M., S.A., Y.U., O.A.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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10
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Kayawake H, Chen-Yoshikawa T, Saito M, Hirano S, Kurokawa R, Yamagishi H, Okabe R, Gochi F, Tokuno J, Ueda S, Yokoyama Y, Ikeda M, Oda H, Yamada Y, Yutaka Y, Nakajima D, Ohsumi A, Hamaji M, Date H. Hydrogen-Rich Preservation Solution Attenuates Lung Ischemia-Reperfusion Injury after Prolonged Cold Ischemia in a Canine Left Lung Transplant Model. J Heart Lung Transplant 2019. [DOI: 10.1016/j.healun.2019.01.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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11
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Iwase R, Kurokawa R, Ueno J. Synthesis of modified double stranded RNAs containing duplex regions between amide-linked RNA and RNA at both ends and enhanced nuclease resistance. ACTA ACUST UNITED AC 2009:119-20. [DOI: 10.1093/nass/nrp060] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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12
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Abstract
BACKGROUND X-linked myotubular myopathy (XLMTM) is a severe congenital disorder characterized by marked muscle weakness and hypotonia. Myotubularin, the protein product of the causative gene, MTM1, is thought to be a phosphatase for phosphatidylinositol-3-phosphate and may be involved in membrane trafficking. Analysis of MTM1 knocked-out mice indicates that the characteristic small fibers in XLMTM muscles are due to atrophy rather than hypoplasia. OBJECTIVE To characterize gene expression profiling of skeletal muscles with XLMTM. METHOD The authors analyzed the expression of more than 4,200 genes in skeletal muscles from eight patients with XLMTM using their custom cDNA microarray. RESULTS In XLMTM, gene expression analysis revealed pathognomonic upregulation of transcripts for cytoskeletal and extracellular matrix proteins within or around atrophic myofibers. CONCLUSION Remodeling of cytoskeletal and extracellular architecture appears to contribute to atrophy and intracellular organelle disorganization in XLMTM myofibers.
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MESH Headings
- Cytoskeletal Proteins/genetics
- Cytoskeletal Proteins/metabolism
- Cytoskeleton/genetics
- Cytoskeleton/metabolism
- Cytoskeleton/pathology
- Extracellular Matrix/genetics
- Extracellular Matrix/metabolism
- Extracellular Matrix/pathology
- Extracellular Matrix Proteins/genetics
- Gene Expression Profiling
- Gene Expression Regulation, Developmental/genetics
- Genetic Diseases, X-Linked/genetics
- Genetic Predisposition to Disease/genetics
- Humans
- Immunohistochemistry
- Infant
- Infant, Newborn
- Muscle Fibers, Skeletal/metabolism
- Muscle Fibers, Skeletal/pathology
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Muscle, Skeletal/physiopathology
- Muscular Atrophy/genetics
- Muscular Atrophy/metabolism
- Muscular Atrophy/physiopathology
- Myopathies, Structural, Congenital/genetics
- Myopathies, Structural, Congenital/metabolism
- Myopathies, Structural, Congenital/physiopathology
- Oligonucleotide Array Sequence Analysis
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Up-Regulation/genetics
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Affiliation(s)
- S Noguchi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry,4-1-1 Ogawahigashi, Kodaira, Tokyo, 187-8502, Japan.
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13
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Noguchi S, Tsukahara T, Fujita M, Kurokawa R, Tachikawa M, Toda T, Tsujimoto A, Arahata K, Nishino I. cDNA microarray analysis of individual Duchenne muscular dystrophy patients. Hum Mol Genet 2003. [DOI: 10.1093/hmg/ddg065] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Steffan JS, Bodai L, Pallos J, Poelman M, McCampbell A, Apostol BL, Kazantsev A, Schmidt E, Zhu YZ, Greenwald M, Kurokawa R, Housman DE, Jackson GR, Marsh JL, Thompson LM. Histone deacetylase inhibitors arrest polyglutamine-dependent neurodegeneration in Drosophila. Nature 2001; 413:739-43. [PMID: 11607033 DOI: 10.1038/35099568] [Citation(s) in RCA: 861] [Impact Index Per Article: 37.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Proteins with expanded polyglutamine repeats cause Huntington's disease and other neurodegenerative diseases. Transcriptional dysregulation and loss of function of transcriptional co-activator proteins have been implicated in the pathogenesis of these diseases. Huntington's disease is caused by expansion of a repeated sequence of the amino acid glutamine in the abnormal protein huntingtin (Htt). Here we show that the polyglutamine-containing domain of Htt, Htt exon 1 protein (Httex1p), directly binds the acetyltransferase domains of two distinct proteins: CREB-binding protein (CBP) and p300/CBP-associated factor (P/CAF). In cell-free assays, Httex1p also inhibits the acetyltransferase activity of at least three enzymes: p300, P/CAF and CBP. Expression of Httex1p in cultured cells reduces the level of the acetylated histones H3 and H4, and this reduction can be reversed by administering inhibitors of histone deacetylase (HDAC). In vivo, HDAC inhibitors arrest ongoing progressive neuronal degeneration induced by polyglutamine repeat expansion, and they reduce lethality in two Drosophila models of polyglutamine disease. These findings raise the possibility that therapy with HDAC inhibitors may slow or prevent the progressive neurodegeneration seen in Huntington's disease and other polyglutamine-repeat diseases, even after the onset of symptoms.
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Affiliation(s)
- J S Steffan
- Department of Psychiatry and Human Behavior, Gillespie 2121, University of California, Irvine, California 92697, USA
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15
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Kurokawa R, Kuroshima Y, Yoshida K, Kawase T. Spontaneous thrombosis of intracavernous internal carotid artery aneurysm and parent artery occlusion in patients with positive balloon test occlusion--two case reports. Neurol Med Chir (Tokyo) 2001; 41:436-41. [PMID: 11593970 DOI: 10.2176/nmc.41.436] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Two patients with giant intracavernous internal carotid artery (ICA) aneurysms were intolerant to balloon test occlusion of the ICA, and later developed spontaneous thrombosis of the aneurysm and the parent ICA without ischemic sequelae. Case 1: A 60-year-old female with a giant right intracavernous ICA aneurysm presented with right abducens nerve paresis. An unsuccessful extracranial-to-intracranial bypass graft operation was complicated by transient postoperative ophthalmoplegia. The patient did not tolerate balloon test occlusion of the right ICA after attempted bypass surgery, and was treated conservatively. The patient presented with acute onset of headache 3 years later. Case 2: A 50-year-old female with a giant right intracavernous ICA aneurysm presented with right abducens nerve paresis. The patient was managed conservatively after a positive balloon test occlusion of the right ICA. The patient suffered transient hypopituitarism and acute onset of headache 2 years later. Spontaneous thrombosis of the aneurysms and occlusion of the parent ICA were found in both patients. Neither had major hemispheric infarcts, but the first patient had asymptomatic infarcts, which were presumed to be thromboembolic in nature. Patients with intracavernous ICA aneurysms who have positive balloon test occlusions appear to develop tolerance to spontaneous and gradual occlusion of the ICA without significant sequelae. However, these patients have an increased risk of developing embolic infarctions. The role for anticoagulation and repeat hemodynamic tests remains unclear.
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Affiliation(s)
- R Kurokawa
- Department of Neurosurgery, Keio University School of Medicine, Tokyo
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16
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Murata T, Kurokawa R, Krones A, Tatsumi K, Ishii M, Taki T, Masuno M, Ohashi H, Yanagisawa M, Rosenfeld MG, Glass CK, Hayashi Y. Defect of histone acetyltransferase activity of the nuclear transcriptional coactivator CBP in Rubinstein-Taybi syndrome. Hum Mol Genet 2001; 10:1071-6. [PMID: 11331617 DOI: 10.1093/hmg/10.10.1071] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
CREB-binding protein (CBP) is a transcriptional coactivator that has intrinsic histone acetyltransferase (HAT) activity. CBP is the causative gene of Rubinstein-Taybi syndrome (RTS). To investigate the relationships between CBP HAT activity and RTS, we analyzed 16 RTS patients. A microdeletion was identified in one patient by fluorescent in situ hybridization analysis. Heteroallelic mutations were identified in five patients by reverse transcriptase-polymerase chain reaction-single-strand conformation polymorphism analysis and sequencing. These included a 2 bp deletion between nucleotides 4319 and 4320, an 11 bp deletion between nucleotides 4898 and 4908, a 14 bp insertion (CCTCGGTCCTGCAC) between nucleotides 5212 and 5213, a 2 bp deletion between nucleotides 5222 and 5223, and a missense mutation from guanine (G) to cytosine (C) at nucleotide 4951 that changed codon 1378 from CGG (arginine) to CCG (proline). The identical missense mutation was introduced into the recombinant mouse CBP. It abolished the HAT activity of CBP and the ability of CBP to transactivate cyclic AMP-response element binding protein (CREB), in HAT assays and in microinjection experiments, respectively. These results suggest that the loss of the HAT activity of CBP may cause RTS, as the first example of a defect of HAT activity in a human disease. Our findings raise the possibility that treatment of RTS patients with histone deacetylase inhibitors might have beneficial effects.
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Affiliation(s)
- T Murata
- Department of Pediatrics, Graduate School of Medicine, University of Tokyo, Tokyo 113-8655, Japan
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17
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Ueno M, Kurokawa R, Renauld H, Watanabe K, Ushimaru T, Uritani M, Yoshinaga K, Hiraoka Y. Schizosaccharomyces pombe taf1+ is required for nitrogen starvation-induced sexual development and for entering the dormant GO state. Curr Genet 2001; 38:307-13. [PMID: 11270572 DOI: 10.1007/s002940000168] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Environmental change, such as nutritional starvation, induces physiological and morphological alterations that enable fission yeast cells to survive. We isolated a novel gene, taf1+, required for the response to nitrogen starvation in the fission yeast Schizosaccharomyces pombe. taf1 disruptants could not mate upon nitrogen starvation, but could upon carbon starvation. taf1 disruptants had a defect in inducing stell+ expression under nitrogen starvation conditions. Furthermore, they lost viability quickly in nitrogen-depleted medium. Unlike wild-type cells, starved taf1-cells had nuclear chromatin that were flat and adhered to the cell periphery. These results indicate that tqf1+ is required for nitrogen starvation-induced sexual development and entering the dormant G0 state.
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Affiliation(s)
- M Ueno
- Department of Chemistry, Faculty of Sciences, Shizuoka University, Japan.
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18
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Jepsen K, Hermanson O, Onami TM, Gleiberman AS, Lunyak V, McEvilly RJ, Kurokawa R, Kumar V, Liu F, Seto E, Hedrick SM, Mandel G, Glass CK, Rose DW, Rosenfeld MG. Combinatorial roles of the nuclear receptor corepressor in transcription and development. Cell 2000; 102:753-63. [PMID: 11030619 DOI: 10.1016/s0092-8674(00)00064-7] [Citation(s) in RCA: 386] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Transcriptional repression plays crucial roles in diverse aspects of metazoan development, implying critical regulatory roles for corepressors such as N-CoR and SMRT. Altered patterns of transcription in tissues and cells derived from N-CoR gene-deleted mice and the resulting block at specific points in CNS, erythrocyte, and thymocyte development indicated that N-CoR was a required component of short-term active repression by nuclear receptors and MAD and of a subset of long-term repression events mediated by REST/NRSF. Unexpectedly, N-CoR and a specific deacetylase were also required for transcriptional activation of one class of retinoic acid response element. Together, these findings suggest that specific combinations of corepressors and histone deacetylases mediate the gene-specific actions of DNA-bound repressors in development of multiple organ systems.
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Affiliation(s)
- K Jepsen
- Howard Hughes Medical Institute, Department of Biology, University of California, San Diego, La Jolla 92093, USA
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19
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Llopis J, Westin S, Ricote M, Wang Z, Cho CY, Kurokawa R, Mullen TM, Rose DW, Rosenfeld MG, Tsien RY, Glass CK, Wang J. Ligand-dependent interactions of coactivators steroid receptor coactivator-1 and peroxisome proliferator-activated receptor binding protein with nuclear hormone receptors can be imaged in live cells and are required for transcription. Proc Natl Acad Sci U S A 2000; 97:4363-8. [PMID: 10760302 PMCID: PMC18247 DOI: 10.1073/pnas.97.8.4363] [Citation(s) in RCA: 117] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Members of the nuclear receptor superfamily are thought to activate transcription by recruitment of one or more recently identified coactivator complexes. Here we demonstrate that both peroxisome proliferator-activated receptor binding protein (PBP) and steroid receptor coactivator-1 (SRC-1) are required for ligand-dependent transcription of transiently transfected and chromosomally integrated reporter genes by the estrogen receptor (ER) and retinoic acid receptor (RAR). To examine ligand-dependent interactions between nuclear receptors and specific coactivators in living cells, these proteins were tagged with cyan (CFP) and yellow (YFP) mutants of the green fluorescent protein. Fluorescence resonance energy transfer (FRET) from the CFP to the YFP indicated interaction between the receptor and coactivator. CFP fusions to RAR or its ligand-binding domain exhibited rapid ligand-dependent FRET to YFP-tagged nuclear receptor interaction domains of the coactivators SRC-1 and PBP. The ER-ligand-binding domain, unlike RAR, also exhibited some basal interaction with coactivators in unstimulated cells that was abolished by the receptor antagonists tamoxifen or ICI182,780. Inhibition of FRET by tamoxifen but not ICI182,780 could be reversed by estradiol, whereas estradiol-enhanced FRET could not be inhibited by either antagonist, indicating that ligand effects can show varying degrees of hysteresis. These findings suggest that ligand-dependent transcriptional activities of the RAR and ER require concurrent or sequential recruitment of SRC-1 and PBP-containing coactivator complexes.
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Affiliation(s)
- J Llopis
- Department of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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20
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Perissi V, Staszewski LM, McInerney EM, Kurokawa R, Krones A, Rose DW, Lambert MH, Milburn MV, Glass CK, Rosenfeld MG. Molecular determinants of nuclear receptor-corepressor interaction. Genes Dev 1999; 13:3198-208. [PMID: 10617569 PMCID: PMC317209 DOI: 10.1101/gad.13.24.3198] [Citation(s) in RCA: 413] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/1999] [Accepted: 10/29/1999] [Indexed: 12/23/2022]
Abstract
Retinoic acid and thyroid hormone receptors can act alternatively as ligand-independent repressors or ligand-dependent activators, based on an exchange of N-CoR or SMRT-containing corepressor complexes for coactivator complexes in response to ligands. We provide evidence that the molecular basis of N-CoR recruitment is similar to that of coactivator recruitment, involving cooperative binding of two helical interaction motifs within the N-CoR carboxyl terminus to both subunits of a RAR-RXR heterodimer. The N-CoR and SMRT nuclear receptor interaction motifs exhibit a consensus sequence of LXX I/H I XXX I/L, representing an extended helix compared to the coactivator LXXLL helix, which is able to interact with specific residues in the same receptor pocket required for coactivator binding. We propose a model in which discrimination of the different lengths of the coactivator and corepressor interaction helices by the nuclear receptor AF2 motif provides the molecular basis for the exchange of coactivators for corepressors, with ligand-dependent formation of the charge clamp that stabilizes LXXLL binding sterically inhibiting interaction of the extended corepressor helix.
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Affiliation(s)
- V Perissi
- University of California, San Diego (UCSD), Graduate Student, Molecular Pathology Program, UCSD, La Jolla, California 92095-0648 USA
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21
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Kurokawa R, Saito R, Nakamura Y, Kagami H, Ichikizaki K. Ruptured vertebral artery-posterior inferior cerebellar artery aneurysm associated with facial nerve paresis successfully treated with interlocking detachable coils--case report. Neurol Med Chir (Tokyo) 1999; 39:863-6. [PMID: 10639814 DOI: 10.2176/nmc.39.863] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
An 81-year-old female presented with severe headache. Computed tomography revealed subarachnoid hemorrhage. She developed right facial nerve paresis on the next day. Angiography revealed a right vertebral artery-posterior inferior cerebellar artery aneurysm. The aneurysm was successfully occluded with interlocking detachable coils (IDCs) on the 7th day. Magnetic resonance (MR) imaging 1 month after IDC placement showed partially thrombosed aneurysm near the internal acoustic meatus. Ten months after the ictus, MR imaging revealed marked resolution of the intra-aneurysmal thrombus and reduction of the aneurysm size. Her facial nerve function gradually recovered during this period. Her facial nerve paresis was probably caused by acute stretching of the facial nerve by the ruptured aneurysm that was in direct contact with the nerve. Intra-aneurysmal thrombosis using coils can reduce aneurysm size and alleviate cranial nerve symptoms.
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Affiliation(s)
- R Kurokawa
- Department of Neurosurgery, National Tokyo Medical Center, Japan
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22
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Sheppard KA, Rose DW, Haque ZK, Kurokawa R, McInerney E, Westin S, Thanos D, Rosenfeld MG, Glass CK, Collins T. Transcriptional activation by NF-kappaB requires multiple coactivators. Mol Cell Biol 1999; 19:6367-78. [PMID: 10454583 PMCID: PMC84607 DOI: 10.1128/mcb.19.9.6367] [Citation(s) in RCA: 366] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/1999] [Accepted: 06/21/1999] [Indexed: 11/20/2022] Open
Abstract
Nuclear factor-kappaB (NF-kappaB) plays a role in the transcriptional regulation of genes involved in inflammation and cell survival. In this report we demonstrate that NF-kappaB recruits a coactivator complex that has striking similarities to that recruited by nuclear receptors. Inactivation of either cyclic AMP response element binding protein (CREB)-binding protein (CBP), members of the p160 family of coactivators, or the CBP-associated factor (p/CAF) by nuclear antibody microinjection prevents NF-kappaB-dependent transactivation. Like nuclear receptor-dependent gene expression, NF-kappaB-dependent gene expression requires specific LXXLL motifs in one of the p160 family members, and enhancement of NF-kappaB activity requires the histone acetyltransferase (HAT) activity of p/CAF but not that of CBP. This coactivator complex is differentially recruited by members of the Rel family. The p50 homodimer fails to recruit coactivators, although the p50-p65 heterodimeric form of the transcription factor assembles the integrator complex. These findings provide new mechanistic insights into how this family of dimeric transcription factors has a differential effect on gene expression.
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Affiliation(s)
- K A Sheppard
- Vascular Research Division, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
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23
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Perissi V, Dasen JS, Kurokawa R, Wang Z, Korzus E, Rose DW, Glass CK, Rosenfeld MG. Factor-specific modulation of CREB-binding protein acetyltransferase activity. Proc Natl Acad Sci U S A 1999; 96:3652-7. [PMID: 10097092 PMCID: PMC22349 DOI: 10.1073/pnas.96.7.3652] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
CREB-binding proteins (CBP) and p300 are essential transcriptional coactivators for a large number of regulated DNA-binding transcription factors, including CREB, nuclear receptors, and STATs. CBP and p300 function in part by mediating the assembly of multiprotein complexes that contain additional cofactors such as p300/CBP interacting protein (p/CIP), a member of the p160/SRC family of coactivators, and the p300/CBP associated factor p/CAF. In addition to serving as molecular scaffolds, CBP and p300 each possess intrinsic acetyltransferase activities that are required for their function as coactivators. Here we report that the adenovirus E1A protein inhibits the acetyltransferase activity of CBP on binding to the C/H3 domain, whereas binding of CREB, or a CREB/E1A fusion protein to the KIX domain, fails to inhibit CBP acetyltransferase activity. Surprisingly, p/CIP can either inhibit or stimulate CBP acetyltransferase activity depending on the specific substrate evaluated and the functional domains present in the p/CIP protein. While the CBP interaction domain of p/CIP inhibits acetylation of histones H3, H4, or high mobility group by CBP, it enhances acetylation of other substrates, such as Pit-1. These observations suggest that the acetyltransferase activities of CBP/p300 and p/CAF can be differentially modulated by factors binding to distinct regions of CBP/p300. Because these interactions are likely to result in differential effects on the coactivator functions of CBP/p300 for different classes of transcription factors, regulation of CBP/p300 acetyltransferase activity may represent a mechanism for integration of diverse signaling pathways.
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Affiliation(s)
- V Perissi
- Howard Hughes Medical Institute, University of California at San Diego, La Jolla, CA 92093-0648, USA
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24
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Xu L, Lavinsky RM, Dasen JS, Flynn SE, McInerney EM, Mullen TM, Heinzel T, Szeto D, Korzus E, Kurokawa R, Aggarwal AK, Rose DW, Glass CK, Rosenfeld MG. Signal-specific co-activator domain requirements for Pit-1 activation. Nature 1998; 395:301-6. [PMID: 9751061 DOI: 10.1038/26270] [Citation(s) in RCA: 224] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
POU-domain proteins, such as the pituitary-specific factor Pit-1, are members of the homeodomain family of proteins which are important in development and homeostasis, acting constitutively or in response to signal-transduction pathways to either repress or activate the expression of specific genes. Here we show that whereas homeodomain-containing repressors such as Rpx2 seem to recruit only a co-repressor complex, the activity of Pit-1 is determined by a regulated balance between a co-repressor complex that contains N-CoR/SMRT, mSin3A/B and histone deacetylases, and a co-activator complex that includes the CREB-binding protein (CBP) and p/CAF. Activation of Pit-1 by cyclic AMP or growth factors depends on distinct amino- and carboxy-terminal domains of CBP, respectively. Furthermore, the histone acetyltransferase functions of CBP or p/CAF are required for Pit-1 function that is stimulated by cyclic AMP or growth factors, respectively. These data show that there is a switch in specific requirements for histone acetyltransferases and CBP domains in mediating the effects of different signal-transduction pathways on specific DNA-bound transcription factors.
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Affiliation(s)
- L Xu
- Howard Hughes Medical Institute, University of California at San Diego, La Jolla 92093-0648, USA
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25
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Westin S, Kurokawa R, Nolte RT, Wisely GB, McInerney EM, Rose DW, Milburn MV, Rosenfeld MG, Glass CK. Interactions controlling the assembly of nuclear-receptor heterodimers and co-activators. Nature 1998; 395:199-202. [PMID: 9744281 DOI: 10.1038/26040] [Citation(s) in RCA: 273] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Retinoic-acid receptor-alpha (RAR-alpha) and peroxisome proliferator-activated receptor-gamma (PPAR-gamma) are members of the nuclear-receptor superfamily that bind to DNA as heterodimers with retinoid-X receptors (RXRs). PPAR-RXR heterodimers can be activated by PPAR or RXR ligands, whereas RAR-RXR heterodimers are selectively activated by RAR ligands only, because of allosteric inhibition of the binding of ligands to RXR by RAR. However, RXR ligands can potentiate the transcriptional effects of RAR ligands in cells. Transcriptional activation by nuclear receptors requires a carboxy-terminal helical region, termed activation function-2 (AF-2), that forms part of the ligand-binding pocket and undergoes a conformational change required for the recruitment of co-activator proteins, including NCoA-1/SRC-1. Here we show that allosteric inhibition of RXR results from a rotation of the RXR AF-2 helix that places it in contact with the RAR coactivator-binding site. Recruitment of an LXXLL motif of SRC-1 to RAR in response to ligand displaces the RXR AF-2 domain, allowing RXR ligands to bind and promote the binding of a second LXXLL motif from the same SRC-1 molecule. These results may partly explain the different responses of nuclear-receptor heterodimers to RXR-specific ligands.
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Affiliation(s)
- S Westin
- Division of Cellular and Molecular Medicine, University of California, San Diego, La Jolla 92093-0651, USA
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26
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Nolte RT, Wisely GB, Westin S, Cobb JE, Lambert MH, Kurokawa R, Rosenfeld MG, Willson TM, Glass CK, Milburn MV. Ligand binding and co-activator assembly of the peroxisome proliferator-activated receptor-gamma. Nature 1998; 395:137-43. [PMID: 9744270 DOI: 10.1038/25931] [Citation(s) in RCA: 1470] [Impact Index Per Article: 56.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The peroxisome proliferator-activated receptor-gamma (PPAR-gamma) is a ligand-dependent transcription factor that is important in adipocyte differentiation and glucose homeostasis and which depends on interactions with co-activators, including steroid receptor co-activating factor-1 (SRC-1). Here we present the X-ray crystal structure of the human apo-PPAR-gamma ligand-binding domain (LBD), at 2.2 A resolution; this structure reveals a large binding pocket, which may explain the diversity of ligands for PPAR-gamma. We also describe the ternary complex containing the PPAR-gamma LBD, the antidiabetic ligand rosiglitazone (BRL49653), and 88 amino acids of human SRC-1 at 2.3 A resolution. Glutamate and lysine residues that are highly conserved in LBDs of nuclear receptors form a 'charge clamp' that contacts backbone atoms of the LXXLL helices of SRC-1. These results, together with the observation that two consecutive LXXLL motifs of SRC-1 make identical contacts with both subunits of a PPAR-gamma homodimer, suggest a general mechanism for the assembly of nuclear receptors with co-activators.
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Affiliation(s)
- R T Nolte
- Department of Structural Chemistry, Glaxo Wellcome Research and Development, Research Triangle Park, North Carolina 27709, USA
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27
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Abstract
CREB binding protein (CBP) functions as an essential coactivator of transcription factors that are inhibited by the adenovirus early gene product E1A. Transcriptional activation by the signal transducer and activator of transcription-1 (STAT1) protein requires the C/H3 domain in CBP, which is the primary target of E1A inhibition. Here it was found that the C/H3 domain is not required for retinoic acid receptor (RAR) function, nor is it involved in E1A inhibition. Instead, E1A inhibits RAR function by preventing the assembly of CBP-nuclear receptor coactivator complexes, revealing differences in required CBP domains for transcriptional activation by RAR and STAT1.
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Affiliation(s)
- R Kurokawa
- Division of Cellular and Molecular Medicine, Department of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0651, USA
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28
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Korzus E, Torchia J, Rose DW, Xu L, Kurokawa R, McInerney EM, Mullen TM, Glass CK, Rosenfeld MG. Transcription factor-specific requirements for coactivators and their acetyltransferase functions. Science 1998; 279:703-7. [PMID: 9445475 DOI: 10.1126/science.279.5351.703] [Citation(s) in RCA: 510] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Different classes of mammalian transcription factors-nuclear receptors, cyclic adenosine 3',5'-monophosphate-regulated enhancer binding protein (CREB), and signal transducer and activator of transcription-1 (STAT-1)-functionally require distinct components of the coactivator complex, including CREB-binding protein (CBP/p300), nuclear receptor coactivators (NCoAs), and p300/CBP-associated factor (p/CAF), based on their platform or assembly properties. Retinoic acid receptor, CREB, and STAT-1 also require different histone acetyltransferase (HAT) activities to activate transcription. Thus, transcription factor-specific differences in configuration and content of the coactivator complex dictate requirements for specific acetyltransferase activities, providing an explanation, at least in part, for the presence of multiple HAT components of the complex.
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Affiliation(s)
- E Korzus
- Howard Hughes Medical Institute, University of California San Diego (UCSD), 9500 Gilman Drive, La Jolla, CA 92093-0648, USA
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29
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Yamada F, Fukuda S, Ajimi Y, Yamaguchi N, Katayama M, Kurokawa R. Spontaneous occlusion of the circle of Willis(Moya-Moya disease): One disease entity, both juvenile and adult type. Clin Neurol Neurosurg 1997. [DOI: 10.1016/s0303-8467(97)81558-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Glass CK, Rosenfeld MG, Rose DW, Kurokawa R, Kamei Y, Xu L, Torchia J, Ogliastro MH, Westin S. Mechanisms of transcriptional activation by retinoic acid receptors. Biochem Soc Trans 1997; 25:602-5. [PMID: 9191164 DOI: 10.1042/bst0250602] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- C K Glass
- Division of Cellular and Molecular Medicine, University of California, San Diego, La Jolla 92093-0651, USA
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31
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DiRenzo J, Söderstrom M, Kurokawa R, Ogliastro MH, Ricote M, Ingrey S, Hörlein A, Rosenfeld MG, Glass CK. Peroxisome proliferator-activated receptors and retinoic acid receptors differentially control the interactions of retinoid X receptor heterodimers with ligands, coactivators, and corepressors. Mol Cell Biol 1997; 17:2166-76. [PMID: 9121466 PMCID: PMC232065 DOI: 10.1128/mcb.17.4.2166] [Citation(s) in RCA: 204] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
As the obligate member of most nuclear receptor heterodimers, retinoid X receptors (RXRs) can potentially perform two functions: cooperative binding to hormone response elements and coordinate regulation of target genes by RXR ligands. In this paper we describe allosteric interactions between RXR and two heterodimeric partners, retinoic acid receptors (RARs) and peroxisome proliferator-activated receptors (PPARs); RARs and PPARs prevent and permit activation by RXR-specific ligands, respectively. By competing for dimerization with RXR on response elements consisting of direct-repeat half-sites spaced by 1 bp (DR1 elements), the relative abundance of RAR and PPAR determines whether the RXR signaling pathway will be functional. In contrast to RAR, which prevents the binding of RXR ligands and recruits the nuclear receptor corepressor N-CoR, PPAR permits the binding of SRC-1 in response to both RXR and PPAR ligands. Overexpression of SRC-1 markedly potentiates ligand-dependent transcription by PPARgamma, suggesting that SRC-1 serves as a coactivator in vivo. Remarkably, the ability of RAR to both block the binding of ligands to RXR and interact with corepressors requires the CoR box, a structural motif residing in the N-terminal region of the RAR ligand binding domain. Mutations in the CoR box convert RAR from a nonpermissive to a permissive partner of RXR signaling on DR1 elements. We suggest that the differential recruitment of coactivators and corepressors by RAR-RXR and PPAR-RXR heterodimers provides the basis for a transcriptional switch that may be important in controlling complex programs of gene expression, such as adipocyte differentiation.
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Affiliation(s)
- J DiRenzo
- Department of Medicine, University of California, San Diego, La Jolla 92093-0651, USA
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32
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Hanstein B, Eckner R, DiRenzo J, Halachmi S, Liu H, Searcy B, Kurokawa R, Brown M. p300 is a component of an estrogen receptor coactivator complex. Proc Natl Acad Sci U S A 1996; 93:11540-5. [PMID: 8876171 PMCID: PMC38093 DOI: 10.1073/pnas.93.21.11540] [Citation(s) in RCA: 304] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The estrogen receptor (ER) is a ligand-dependent transcription factor that regulates expression of target genes in response to estrogen in concert with other cellular signaling pathways. This suggests that the mechanism by which ER transmits an activating signal to the general transcription machinery may include factors that integrate these diverse signals. We have previously characterized the estrogen receptor-associated protein, ERAP160, as a factor that complexes with ER in an agonist-dependent manner. We have now found that the transcriptional coactivator p300 associates with agonist bound ER and augments ligand-dependent activation by ER. Our studies show that an ER coactivator complex involves a direct hormone-dependent interaction between ER and ERAP160, resulting in the recruitment of p300. In addition, antibodies directed against the cloned steroid receptor coactivator 1 (SRC1) recognize ERAP160. The known role of p300 in multiple signal transduction pathways, including those involving the second messenger cAMP, suggests p300 functions as a point of integration between ER and these other pathways.
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Affiliation(s)
- B Hanstein
- Division of Neoplastic Disease Mechanisms, Dana-Farber Cancer Institute, Boston, MA 02115, USA
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33
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Katayama S, Ozoe F, Kurokawa R, Tanaka K, Nakagawa T, Matsuda H, Kawamukai M. Genetic analysis of the sam mutations, which induce sexual development with no requirement for nutritional starvation in fission yeast. Biosci Biotechnol Biochem 1996; 60:994-9. [PMID: 8695917 DOI: 10.1271/bbb.60.994] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The cAMP pathway and the Ras pathway are the two major pathways to sexual development in the fission yeast Schizosaccharomyces pombe. To understand the cAMP pathway or the related pathway, we analyzed mutants that display a phenotype similar to cyr1-, that is, hyper-sporulation. Nine mutants termed sam (sporulation abnormal mutant), which are highly inclined to sexual development despite the presence of nitrogen sources, were partially characterized. Cyclic AMP was detected in all nine sam mutant cells, and over-expression of the adenylyl cyclase gene (cyr1) failed to suppress the hyper-sporulation phenotype of these sam mutants, suggesting that none of the sam mutants were likely to be allelic to cyr1. Epistatic tests of sam mutants showed that they were divided into two dominant and seven recessive mutants. Dominants were able to make spores in sam/sam+ heterodiploid cells upon abundant nutrients. Both two dominant mutants bypassed the inability to make spores in ras1 deficient diploid cells, suppressed the deficiency to execute sporulation in byr2 deficient diploid cells, but failed to suppress the byr1 deficiency. Two dominant mutations seem not to occur within the byr2 gene.
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Affiliation(s)
- S Katayama
- Department of Applied Bioscience and Biotechnology, Faculty of Life and Environmental Science, Shimane University, Matsue, Japan
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34
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Kamei Y, Xu L, Heinzel T, Torchia J, Kurokawa R, Gloss B, Lin SC, Heyman RA, Rose DW, Glass CK, Rosenfeld MG. A CBP integrator complex mediates transcriptional activation and AP-1 inhibition by nuclear receptors. Cell 1996; 85:403-14. [PMID: 8616895 DOI: 10.1016/s0092-8674(00)81118-6] [Citation(s) in RCA: 1733] [Impact Index Per Article: 61.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Nuclear receptors regulate gene expression by direct activation of target genes and inhibition of AP-1. Here we report that, unexpectedly, activation by nuclear receptors requires the actions of CREB-binding protein (CBP) and that inhibition of AP-1 activity is the apparent result of competition for limiting amounts of CBP/p300 in cells. Utilizing distinct domains, CBP directly interacts with the ligand-binding domain of multiple nuclear receptors and with the p160 nuclear receptor coactivators, which upon cloning have proven to be variants of the SRC-1 protein. Because CBP represents a common factor, required in addition to distinct coactivators for function of nuclear receptors, CREB, and AP-1, we suggest that CBP/p300 serves as an integrator of multiple signal transduction pathways within the nucleus.
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Affiliation(s)
- Y Kamei
- Howard Hughes Medical Institute, School of Medicine, University of California, San Diego, La Jolla, 92093-0648, USA
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35
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Hörlein AJ, Näär AM, Heinzel T, Torchia J, Gloss B, Kurokawa R, Ryan A, Kamei Y, Söderström M, Glass CK. Ligand-independent repression by the thyroid hormone receptor mediated by a nuclear receptor co-repressor. Nature 1995; 377:397-404. [PMID: 7566114 DOI: 10.1038/377397a0] [Citation(s) in RCA: 1428] [Impact Index Per Article: 49.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Thyroid-hormone and retinoic-acid receptors exert their regulatory functions by acting as both activators and repressors of gene expression. A nuclear receptor co-repressor (N-CoR) of relative molecular mass 270K has been identified which mediates ligand-independent inhibition of gene transcription by these receptors, suggesting that the molecular mechanisms of repression by thyroid-hormone and retinoic-acid receptors are analogous to the co-repressor-dependent transcriptional inhibitory mechanisms of yeast and Drosophila.
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Affiliation(s)
- A J Hörlein
- Howard Hughes Medical Institute, University of California, San Diego, La Jolla 92093-0648, USA
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36
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Kurokawa R, Söderström M, Hörlein A, Halachmi S, Brown M, Rosenfeld MG, Glass CK. Polarity-specific activities of retinoic acid receptors determined by a co-repressor. Nature 1995; 377:451-4. [PMID: 7566126 DOI: 10.1038/377451a0] [Citation(s) in RCA: 388] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Retinoic acid receptors (RARs) and retinoid-X receptors (RXRs) activate or repress transcription by binding as heterodimers to DNA-response elements that generally consist of two direct repeat half-sites of consensus sequence AGGTCA. On response elements consisting of direct repeats spaced by five base pairs (DR + 5 elements), RAR/RXR heterodimers activate transcription in response to RAR-specific ligands, such as all-trans-retinoic acid (RA). In contrast, on elements consisting of direct repeats spaced by one base pair (DR + 1 elements), RAR/RXR heterodimers exhibit little or no response to activating ligands and repress RXR-dependent transcription. Here we show that ligand-dependent transactivation by RAR on DR + 5 elements requires the dissociation of a new nuclear receptor co-repressor, N-CoR, and recruitment of the putative co-activators p140 and p160. Surprisingly, on DR + 1 elements, N-CoR remains associated with RAR/RXR heterodimers even in the presence of RAR ligands, resulting in constitutive repression. These observations indicate that DNA-response elements can allosterically regulate RAR-co-repressor interactions to determine positive or negative regulation of gene expression.
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Affiliation(s)
- R Kurokawa
- Department of Medicine, University of California, San Diego, La Jolla 92093-0651, USA
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37
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Kurokawa R, DiRenzo J, Boehm M, Sugarman J, Gloss B, Rosenfeld MG, Heyman RA, Glass CK. Regulation of retinoid signalling by receptor polarity and allosteric control of ligand binding. Nature 1994; 371:528-31. [PMID: 7935766 DOI: 10.1038/371528a0] [Citation(s) in RCA: 356] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Retinoic acid receptors (RARs) and retinoid X receptors (RXRs) regulate transcription by binding to response elements in target genes that generally consist of two direct repeat half-sites of consensus sequence AGGTCA (ref. 1). RAR/RXR heterodimers activate transcription in response to all-trans or 9-cis retinoic acid by binding to direct repeats spaced by five base pairs (DR5 elements), such that RAR occupies the downstream half-site. RXR homodimers activate transcription in response to 9-cis retinoic acid by binding to direct repeats spaced by one base pair (DR1 elements). Although RXR/RAR heterodimers bind to DR1 elements with higher affinity than RXR homodimers, in most contexts they are unable to activate transcription in response to either all-trans or 9-cis retinoic acid. As a result, RARs inhibit RXR-dependent transcription from these sites. We report that the switching of the RAR from an activator to an inhibitor of retinoid-dependent transcription requires that it be bound to the upstream half-site of DR1 elements and that it allosterically block the binding of ligand to the RXR.
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Affiliation(s)
- R Kurokawa
- Division of Cellular and Molecular Medicine, University of California, San Diego 92093-0656
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38
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Yamaguchi H, Kaku H, Onodera T, Kurokawa R, Morisada M. Peripolar cells in guinea pigs under experimental hyperplasia of juxtaglomerular cells induced by long-term, low-dose calcium condition. Exp Toxicol Pathol 1994; 46:283-6. [PMID: 7894237 DOI: 10.1016/s0940-2993(11)80101-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The peripolar cell was described in the glomeruli of sheep by Ryan et al. in 1979 and these cells have subsequently been detected in many species (Ryan et al. 1982; Gall et al. 1986; Hanner et al. 1980). The peripolar cells are located at the junction between the podocytes of the glomerular capillaries and the epithelial lining of Bowmann's capsule, encircling the hilar region of the glomerular tuft. Functionally, the peripolar cells have been considered to be a part of the juxtaglomerular apparatus but the precise nature of the cells has not been identified (Gardiner et al. 1985). Recently, it has been found that an antibody against rat urinary kallikrein reacts positively with sheep peripolar cell (Gall et al. 1984). This finding has led to the suggestion that the peripolar cells may influence the renin secretion through the kallikrein-kinin system. In our experiments with long-term low-calcium condition accompanied with hyperplasia of juxtaglomerular cells the peripolar cells were easily detected. The results suggests that the increase in the number of peripolar cells is closely related to the hyperplasia of juxtaglomerular cells.
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Affiliation(s)
- H Yamaguchi
- Department of Pathology, School of Medicine, Keio University Tokyo Electric Power Hospital, Japan
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39
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Yamaguchi H, Morisada M, Kaku H, Onodera T, Kurokawa R. Necklace-like detachment of endothelial cell layer from arterial wall under low-calcium condition. Exp Toxicol Pathol 1994; 46:307-13. [PMID: 7894241 DOI: 10.1016/s0940-2993(11)80107-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The diversified morphological manifestations in various tissues and organs obtained by administration of differing amounts of calcium chelating agents were reported in previous papers (Yamaguchi et al 1981 a & b; 1982; 1990; 1993). In our recent research described here, administration of a moderate dose of Na2EDTA over the short term demonstrated necklace-like detachment from the arterial wall without disruption of the endothelial cell chain. Intercellular spaces in the media just beneath the detached endothelial cell layer was stained strongly with colloidal iron staining. Electron microscopic observation revealed that the detached endothelial cells showed a lot of elongated anchoring villi from the basal surface, usually seen at the luminal surface, adhered to the degenerative and thin flattened internal elastic lamellae. The alteration of the colloidal iron staining of the vascular wall under the low-calcium condition is suggested to be induced by loosening of the molecular structure of glycosaminoglycans (GAGs) as well as glycoproteins (GPs), comprising the important component of the intercellular matrix and elastic lamellae, which would induce a change in their pasty or viscous character. This would be an accelerative factor for detachment of endothelial cells. Moreover, the lack of the waving of the internal elastic lamellae, trapping of endothelial cytoplasmic processes among them, would play the decisive role in the total detachment of the endothelial cell layer. On the other hand, the low-calcium condition did not adversely influence the joining of endothelial cells. The pathognomatic mechanism will be discussed, with a comparison made to the angiolytic changes provoked by a large amount of Na2EDTA.
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Affiliation(s)
- H Yamaguchi
- Department of Pathology, School of Medicine, Keio University, Japan
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Yamaguchi H, Kaku H, Onodera T, Kurokawa R, Morisada M. Experimental idiopathic dilated cardiomyopathy under low-calcium condition. Exp Toxicol Pathol 1994; 46:223-7. [PMID: 8000243 DOI: 10.1016/s0940-2993(11)80086-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Administration of long-term, low-dose Na2EDTA leads to moderate or severe thinning of the right ventricular wall with or without rupture. These morphological manifestations are known to be site-dependent on the constriction of pulmonary arteries (Yamaguchi et al. 1993a). They sometimes ensue from aneurysmal dilatation and/or plexiform-like-lesion in a pulmonary artery (Yamaguchi et al. 1993b). The present contribution reports that experimental animals who survived for a longer period, maximum for 6 months, showed dilatation of the left ventricle with a mode-rately thin ventricular wall as well as right ventricular changes, which are similar to the morphological manifestations in idiopathic dilated cardiomyopathy.
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Affiliation(s)
- H Yamaguchi
- Department of Pathology, School of Medicine, Keio University, Tokyo, Japan
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Yamaguchi H, Kaku H, Onodera TA, Kurokawa R, Morisada M. Experimental study on the hyperplasia of juxtaglomerular cells under low-dose, long-term administration of calcium chelating agents. Similar to the morphological manifestation of Bartter's syndrome. Exp Toxicol Pathol 1994; 46:237-41. [PMID: 8000245 DOI: 10.1016/s0940-2993(11)80090-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Bartter's syndrome is a genetic disorder which has very rarely been clinically encountered. However, it is of specific interest with respect to the hormonal layer of the kidney, including renin, angiotensin and aldosterone as well as biological alteration of the various electrolytes. The fundamental morphological manifestation of this disorder is known to be hyperplasia of juxtaglomerular cells, although, until now, no experimental studies on this condition have been reported. Demonstrated in this initial study is the remarkable hyperplasia of the juxtaglomerular cells in all terminal portions of the afferent glomerular arterioles situated near the hilum of the glomerular tuft, using a low-dose, long-term administration of calcium chelating agents. This hyperplasia reported in this paper may lead to a new procedure in the analysis of this syndrome.
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Affiliation(s)
- H Yamaguchi
- Department of Pathology, School of Medicine, Keio University, Tokyo, Japan
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Kyakumoto S, Kurokawa R, Hoshino M, Ota M. Co-expression of epidermal growth factor-receptor and c-erb B-2 proto-oncogene product in human salivary-gland adenocarcinoma cell line HSG and the implications for HSG cell autocrine growth. Arch Oral Biol 1994; 39:569-80. [PMID: 7945015 DOI: 10.1016/0003-9969(94)90132-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The autonomous proliferation of HSG cells is mediated by an autocrine growth factor, a 46K epidermal growth factor (EGF)-like molecule. The receptor for this molecule was investigated. Immunoprecipitation and immunoblotting revealed the expression of two possible receptor molecules, EGF-R and p185erbB-2, in HSG cells. Northern blotting also revealed the co-expression of 5.6-kb EGF-R mRNA and 4.6-kb c-erb B-2 mRNA. When the purified EGF-like molecule was added to the cultures, EGF-R but not p185erbB-2 was autophosphorylated. These results suggest that, although both EGF-R and p185erbB-2 are co-expressed in HSG cells, the EGF-R is the genuine receptor for the EGF-like molecule. However, there is a possibility that p185erB-2 is involved in the signal transduction system. This possibility was examined by using specific antibodies to human EGF-R (hEGF-R), p185erbB-2, and EGF to inhibit the functions of these molecules. Addition of these three antibodies to the cultures inhibited the growth of HSG cells. The antibodies to EGF-R and p185erbB-2 also caused morphological changes such as disturbances of the plasma membrane, and some cell death. Surprisingly, the effect of the anti-p185erbB-2 antibody on growth inhibition and morphology was stronger than that of the anti-hEGF-R antibody. Thus, p185erB-2 expressed in HSG cells has an important function in the signal transduction of HSG cell growth.
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Affiliation(s)
- S Kyakumoto
- Department of Biochemistry, Iwate Medical University School of Dentistry, Morioka, Japan
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Hartong R, Wang N, Kurokawa R, Lazar MA, Glass CK, Apriletti JW, Dillmann WH. Delineation of three different thyroid hormone-response elements in promoter of rat sarcoplasmic reticulum Ca2+ATPase gene. Demonstration that retinoid X receptor binds 5' to thyroid hormone receptor in response element 1. J Biol Chem 1994; 269:13021-9. [PMID: 8175722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Thyroid hormone (3,5,3'-triiodothyronine) positively regulates transcription of the sarcoplasmic reticulum Ca2+ATPase gene in rat heart, and sequences within 559 nucleotides upstream from the transcription start site confer thyroid hormone responsiveness upon a reporter gene. In the present study, three thyroid hormone-response elements (TREs) are identified between nucleotides -485 and -190. Each TRE is active in transient transfection assays and specifically binds 3,5,3'-triiodothyronine receptors (TRs) alpha 1 and beta 1 alone and in combination with retinoid X receptors (RXRs) alpha and beta. TRE 1 is a direct repeat of two half-sites separated by four nucleotides; TREs 2 and 3 are inverted palindromes of two half-sites separated by four and six nucleotides, respectively. Methylation interference analysis of TRE 1 showed binding of a TR alpha 1 monomer to the 3' half-site, whereas the heterodimer contacts both half-sites. Subsequent studies employed TR beta and RXR alpha mutants in which their P-boxes were replaced with the P-box of the glucocorticoid receptor. Bandshifts of wild type and mutant proteins with either wild type TRE 1 or a mutant version, in which the 5' half-site was converted to a glucocorticoid response element half-site, demonstrated preferential binding of RXR to the 5' half-site and of TR to the 3' half-site of TRE 1.
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Affiliation(s)
- R Hartong
- Department of Medicine, University of California, San Diego 92103
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Hartong R, Wang N, Kurokawa R, Lazar M, Glass C, Apriletti J, Dillmann W. Delineation of three different thyroid hormone-response elements in promoter of rat sarcoplasmic reticulum Ca2+ATPase gene. Demonstration that retinoid X receptor binds 5' to thyroid hormone receptor in response element 1. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(18)99978-3] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Kurokawa R, Yu VC, Näär A, Kyakumoto S, Han Z, Silverman S, Rosenfeld MG, Glass CK. Differential orientations of the DNA-binding domain and carboxy-terminal dimerization interface regulate binding site selection by nuclear receptor heterodimers. Genes Dev 1993; 7:1423-35. [PMID: 8392479 DOI: 10.1101/gad.7.7b.1423] [Citation(s) in RCA: 287] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Retinoic acid, thyroid hormone, and vitamin D receptors preferentially activate target genes through response elements that consist of direct repeat arrangements of a core recognition motif of consensus sequence AGGTCA. We present evidence that the preference for direct repeat elements arises from two fundamental differences from steroid hormone receptors. First, retinoic acid, thyroid hormone, and vitamin D receptors are demonstrated to preferentially form heterodimers with the retinoid X receptors. These interactions are mediated by the carboxy-terminal dimerization interface, with heterodimer preference specified by actions of the DNA-binding domain. Second, the DNA-binding domains of heterodimeric receptors appear to be rotationally flexible with respect to the carboxy-terminal dimerization interface. Several independent lines of evidence suggest that, relative to the retinoid X and steroid hormone receptors, the DNA-binding domain of the thyroid hormone receptor is preferentially rotated by approximately 180 degrees with respect to its carboxy-terminal dimerization interface. As a result, solution interactions between the carboxy-terminal dimerization interfaces of the retinoid X and thyroid hormone receptors are predicted to lead to the preferential alignment of their respective DNA-binding domains in a direct repeat configuration. This alignment would position the retinoid X receptor over the upstream recognition motif of direct repeat response elements. Differential orientations of the DNA-binding domain, which contribute to the polarity of heterodimer binding, are regulated by a short sequence (the A box) that is located between the conserved DNA-binding and carboxy-terminal dimerization domains.
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Affiliation(s)
- R Kurokawa
- Division of Cellular and Molecular Medicine, University of California, San Diego, La Jolla 92093-0656
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Affiliation(s)
- C K Glass
- Division of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla 92093-0656
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Kurokawa R, Kyakumoto S, Ota M. Retinoic acid receptor in subclone of human salivary gland adenocarcinoma cell line HSG and effect of retinoic acid on cellular growth. Biochim Biophys Acta 1991; 1095:63-74. [PMID: 1657191 DOI: 10.1016/0167-4889(91)90045-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Retinoic acid (RA) binding has been detected in the nuclei of a subclone (CL-1) of human submandibular adenocarcinoma cell line HSG conditioned to grow in a serum-free defined medium. Competition assay confirmed the specificity of the RA binding. Scatchard analysis showed the binding molecule to have a high affinity and low capacity. From the analyses by gel-filtration and glycerol density gradient centrifugation, the nuclear binding molecule appears to be distinct from cellular RA binding protein (CRABP) in terms of molecular weight. Furthermore, immunoblotting analysis revealed a band (Mr 47,000) reactive with specific antibody to RA receptor (RAR) alpha in the gel containing the nuclear fraction of CL-1 cells. Northern blotting analysis with specific cDNA probes revealed the expression of RAR alpha and RAR gamma in CL-1 cells. These results indicate that CL-1 cells express two types of RAR subtype, suggesting that these receptor molecules may mediate biological effects of RA. Treatment of CL-1 cells with RA resulted in an increase in the incorporation of [3H]thymidine into TCA-insoluble materials. The maximal increase was observed at 10(-6) M around 48 h. Previously, we demonstrated the autocrine growth of HSG cells mediated by epidermal growth factor (EGF) receptors and EGF-like molecules (Kurokawa et al. (1989) Cancer Res. 49, 5136-5142) and showed that RA had no significant effect on the secretion of the EGF-like molecule. RA induced an increase in [125I]EGF binding to CL-1 cells. The increase in the EGF binding was maximal at 24 h at 10(-6) M RA. RA also increased the amount of [3H]leucine-labeled EGF receptor dose-dependently. No significant change was observed in total protein synthesis of CL-1 cells by treatment with RA. These results suggest that RA stimulates the growth of CL-1 cells by increasing EGF receptor levels.
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Affiliation(s)
- R Kurokawa
- Department of Biochemistry, Iwate Medical University School of Dentistry, Morioka, Japan
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Kyakumoto S, Kurokawa R, Ota M. Effect of glucocorticoid on epidermal growth factor receptor in human salivary gland adenocarcinoma cell line HSG. Biochim Biophys Acta 1990; 1053:204-12. [PMID: 2383597 DOI: 10.1016/0167-4889(90)90015-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Human salivary gland adenocarcinoma (HSG) cells treated with 10(-6) M triamcinolone acetonide for 48 h exhibited a 1.7- to 2.0-fold increase in [125I]human epidermal growth factor (hEGF) binding capacity as compared with untreated HSG cells. Scatchard analysis of [125I]EGF binding data revealed that the number of binding sites was 83,700 (+/- 29,200) receptors/cell in untreated cells and 160,500 (+/- 35,500) receptors/cell in treated cells. No substantial change in receptor affinity was detected. The dissociation constant of the EGF receptor was 0.78 (+/- 0.26).10(-9) M for untreated cells, whereas it was 0.93 (+/- 0.31).10(-9)M for treated cells. The triamcinolone acetonide-induced increase in [125I]EGF binding capacity was dose-dependent between 10(-9) and 10(-6)M, and maximal binding was observed at 10(-6)M. EGF receptors on HSG cells were affinity-labeled with [125I]EGF by use of the cross-linking reagent disuccinimidyl suberate (DSS). The cross-linked [125I]EGF was 3-4% of the total [125I]EGF bound to HSG cells. The affinity-labeled EGF receptor was detected as a specific 170 kDa band in the autoradiograph after SDS-polyacrylamide gel electrophoresis (SDS-PAGE). Densitometric analysis revealed that triamcinolone acetonide amplified the intensity of this band 2.0-fold over that of the band of untreated cells. EGF receptor synthesis was also measured by immunoprecipitation of [3H]leucine-labeled EGF receptor protein with anti-hEGF receptor monoclonal antibody. Receptor synthesis was increased 1.7- to 1.8-fold when HSG cells were treated with 10(-8)-10(-6)M triamcinolone acetonide for 48 h. When the immunoprecipitated, [35S]methionine-pulse-labeled EGF receptor was analyzed by SDS-PAGE and fluorography, the newly synthesized EGF receptor was detected at the position of 170 kDa; and treatment of HSG cells with triamcinolone acetonide resulted in a 2.0-fold amplification of this 170 kDa band. There was no significant difference in turnover rate of EGF receptor between treated and untreated HSG cells. These results demonstrate that the triamcinolone acetonide-induced increase in [125I]EGF binding capacity is due to the increased synthesis of EGF receptor protein in HSG cells.
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Affiliation(s)
- S Kyakumoto
- Department of Biochemistry, Iwate Medical University School of Dentistry, Japan
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Kurokawa R, Kyakumoto S, Ota M. Autocrine growth factor in defined serum-free medium of human salivary gland adenocarcinoma cell line HSG. Cancer Res 1989; 49:5136-42. [PMID: 2788497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Human salivary gland adenocarcinoma cell line HSG secretes an epidermal growth factor (EGF)-like molecule and contains EGF receptors. Growth of HSG cells is inhibited by glucocorticoid. We have identified that the growth inhibition by glucocorticoid is induced by the reduced secretion of the EGF-like molecule and that addition of anti-human EGF antibody to the culture specifically inhibits the growth of HSG cells, suggesting that autocrine secretion is involved in the growth of HSG cells. To prove that autocrine secretion functions in glucocorticoid-regulated growth of the HSG cell line, we purified the EGF-like molecule from serum-free, defined medium conditioned by the HSG cells and examined the growth-stimulatory effect of the purified molecule. The cultivation of HSG cells in serum-free defined medium, which contains insulin (10 micrograms/ml) and transferrin (10 micrograms/ml) only as proteinaceous components, resulted in establishment of a new cell line (HSG-SF) which had different morphological features from the parental HSG cell line. HSG-SF cells were found to have basically the same responsiveness to glucocorticoid as parental HSG cells. Parental HSG cells secreted high molecular weight EGF-like molecules (Mr 46,000 and 57,000), which were recognized by specific antibody to low molecular weight human EGF (Mr 6,201). From conditioned, serum-free medium of HSG-SF cells, an EGF-like molecule (Mr 46,000) was purified by using an anti-human EGF antibody-coupled Sepharose CL-4B column. This EGF-like molecule induced a maximal increase (36%) in incorporation of [3H]thymidine into DNA of parental HSG cells as well as low molecular weight human EGF. These observations demonstrate that growth of the HSG cell line is regulated by autocrine secretion.
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Affiliation(s)
- R Kurokawa
- Department of Biochemistry, Iwate Medical University School of Dentistry, Japan
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Kurokawa R, Ota M. Nonactivated and activated glucocorticoid receptor complexes from human salivary gland adenocarcinoma cell line. Biochim Biophys Acta 1988; 970:292-304. [PMID: 3401512 DOI: 10.1016/0167-4889(88)90129-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
[3H]Triamcinolone acetonide glucocorticoid receptor complexes from human salivary gland adenocarcinoma cells (HSG cells) were shown to be activated with an accompanying decrease in molecular weight in intact cells, as analyzed by gel filtration, DEAE chromatography, the mini-column method and glycerol gradient centrifugation. Glucocorticoid receptor complexes consist of steroid-binding protein (or glucocorticoid receptor) and non-steroid-binding factors such as the heat-shock protein of molecular weight 90,000. To determine whether the steroid-binding protein decreases in molecular weight upon activation, affinity labeling of glucocorticoid receptor in intact cells by incubation with [3H]dexamethasone 21-mesylate, which forms a covalent complex with glucocorticoid receptor, was performed. Analysis by gel filtration and a mini-column method indicated that [3H]dexamethasone 21-mesylate-labeled receptor complexes can be activated under culture conditions at 37 degrees C. SDS-polyacrylamide gel electrophoresis of [3H]dexamethasone 21-mesylate-labeled steroid-binding protein resolved only one specific 92 kDa form. Furthermore, only one specific band at 92 kDa was detected in the nuclear fraction which was extracted from the cells incubated at 37 degrees C. These results suggest that there is no change in the molecular weight of steroid-binding protein of HSG cell glucocorticoid receptor complexes upon activation and that the molecular weight of nuclear-binding receptor does not change, although the molecular weight of activated glucocorticoid receptor complexes does decrease. Triamcinolone acetonide induced an inhibitory effect on DNA synthesis in HSG cells. Dexamethasone 21-mesylate exerted no such effect and blocked the action of triamcinolone acetonide on DNA synthesis. These results suggests that dexamethasone 21-mesylate acts as antagonist of glucocorticoid in HSG cells. The fact that dexamethasone 21-mesylate-labeled receptor complexes could be activated and could bind to DNA or nuclei as well as triamcinolone acetonide-labeled complexes suggests that dexamethasone 21-mesylate-labeled complexes can not induce specific gene expression after their binding to DNA.
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Affiliation(s)
- R Kurokawa
- Department of Biochemistry, Iwate Medical University School of Dentistry, Japan
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